A word of advice to the socially ambitious: put down that Sipsmith and Fever Tree, stop calling your father your “best mate” and for goodness’ sake cancel that holiday you’ve just booked in a charming little gîte near Carcassonne.

Along with iPads, trophy spouses and wearing make-up outside London, they have all been decreed as beyond the social pale by Tatler, the house magazine for people who don’t have to buy their own furniture.

More than 60 years after Nancy Mitford first decreed what was U and non-U Tatler has produced an updated list of what is and isn’t acceptable among the upper classes.